I asked the ranger about who handles the iron pour and here is his response.

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Our staff and some dedicated volunteers handle the pour.

Here's a schedule of activities for the day:

12-5:30 pm - Friends of Red Top is selling food and yard games will be set up

2 pm - scratch blocks go on sale (supplies limited; limit 5/person). We have two different sizes; the small size is about 5x5 inches and is $8 and the larger size is about 15x5 and is $15. Visitors can buy a mold and etch a design into it, then when we start the pour we'll pour the iron into the molds and visitors get to take home a unique piece of cast iron art.

6 pm - Iron Pour starts (usually lasts 1.5-2 hours)

8-9:30 pm - Free bluegrass concert at the log cabin

In terms of the pour itself, we use coke as our fuel and instead of iron ore (like would have traditionally been used), we reduce recycled cast iron to molten iron.